Construction of professional looking wing bags:

Buy aluminum/plastic air-bubble insulation foil, aluminum coated on one side only. This is essential as will soon be clear.

Cut out two oversized pieces in the shape of the wing, align the foils on top of each other with the aluminum sides out and the plastic sides in.

Melt together with a flat-iron as used for ironing shirts. Don't apply the flat sole of the iron to the sheeting, but use the narrrow sides of the sole plate instead.

Use a long metal ruler such as a 3 ft piece of square aluminum tube as a guide for straight lines if desired.

This gives a neat clean melted seam, about 1/4 inch wide. Try out various temperature settings to get the best results. After sealing use a pair of scissors to remove surplus sheet at the seams.

Looks totally professional and costs almost nothing. The flat-iron technique makes it a breeze to put the bags together. Much easier than botching with duct tape or a sewing machine...